Sound-absorbing device.



E. OSBORN & J. J. NOLAN.

SOUND ABSQRBING DEVICE. APPLICATION FILED FEB. 13, m5.

Patented Feb. 15 1916.

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.o =31 NSLAN, OF ALBANY, NEV] YORK.

SGUI lB-EJLBSCRHIHG DEVICE.

S ecificaticn of Letters Patent.

Fatented Feb. 15, 1916.

Application filed February 13, E915. Serial No. 8,017.

iliiilLlSlHlQJGZ' c uses a rumble and not only t c receiving end of the line hut reverts the receiver of the telephone Vicinity of the noise, thereby inihearing of the party the tele the zone of the noise. In other noise telephone set enters nitter and reverts to the receiver causing rnnihle in the r ceiver which prevents the the telephone from hearing distinctly; and it is not the receiver nor the Qcl' which catches the foreign nod party nt the other end of the line sled to hear clearly irrespective oi? any i the vicinity of the telephone the sound absorbing device.

our purpose to provide a. device described which may be A applied to any telephone is to exclude noises therefrom and .vhic'n will embrace the desired features of sinipliciby cfiiciency and curability and which may he .nienufactured coinpsrm s oell cost above and other objects in View Drovements in Sound-Ahsorhing Devices of the invention consists in the construction,

combination and arrangement of parts here- 7 innfter set forth in and falling Within the scope of the claims.

In the accompanying drawing; Figure 1 is a view in side elevation of a telephone t ansmitter equipped with a sound absorbing deviceconstructed in accordance with thc'present invention. Fig. 2 is a sectional through the device and transmitter. 3 is a, perspective View of the device l. d signutes the transmitter of e tele hone instrument or set, such transmitter being of any suitehle or Well known construction and provided with the usual mouth piece 2.

3 indicates our improved sound absorbing" device as an entirety and such device comprises e cupshoped body 4: designed to.

fit over inouth piece 2 of the trsnsrnittor and ing the latter piece concentrically of the apart therefrom. The end 1 is formed centrally With I s diameter less than that i. see 2 and formed integral well of the body 4- colleenpening 5* and projectingoutsuch end Wall is s supplemental iece 6. The outer end of the mouth oiece 6 is flared outwardly or hell shape as at Z' and the inner portion of the mouth piece is of a diameter corresponding with of. the opening 5 and relatively as compared With the diameteroi the month piece 2. fzlecnrecl to the inner surface of the end Wall of the eupsheped body and extending across the on opening of the mot" with the t icslly oi: Wardly fro o g the flange thereof surroundopening 5 end the mouth piece 2 between. the

any suitable means may be emmouth piece 6 adjacent to the end wall of the cup and formed on the collar at diametrically opposite points and projecting outwardly therefrom are arms 10 having the outer ends thereof bent at right angles to themselves at 11. and extending toward the telephone transmitter and formed with outwardly projecting lugs 12 adapted to engage similar lugs 13 formed on bent end portions l ltol: arms 15 lllOiLl on a collar 16 surrounding the transnu and extending outwardly from such collar at diametricallyopposite points. The logs 153 and 13 are provided With alining openings and threaded into such openings are securingscrews 17. By means oi this construction, it Will be seen that the sound. absorbing device be rigidly and securely ibis--- tened to the mouth piece of the tele: ione transmitter. it is conceivable, however, that other :lastening means may be employed.

From the foreg ing description taken in connection with the accompanying drawing, the construction, mode of operation and.

manner of employin our improved sound We are acquainted have the Walls thereof lined With material that prevents the escape I absorbing device will be readily apparent. It Will be seen that We have provided a sound absorbing device whereby any noise in the vicinity of the transmitter will be excluded from the latter and absorbed by the diaphragm 8, thereby preventing th transmission of such'noise over the tele phone line enabling the party the iary or supplemental mouth piece is employed merely for the purpose of confining the sound Waves sent into the transmitter and preventing the escape of such Waves from the transmitter so that a person in the vicinity of the telephone instrume Will be unable to hear What is said by the party using the telephone, and not as sound absorbing devices-for preventing the entrance of foreign sounds into the trans-- mitter. Furthermore, none of these sohhd excluding devices, so far as We are awzire, employs a sound absorbing diaphragm that is iuterposed'between the two mouth pieces and that acts to absorb all' sounds other than those sent directly into the transmitter; but these transmitters with which of the sound Waves through such Walls. So far as We know, We are. the first to em ploy a sound absorbing diaphragm between.

the mouth piece of the telephone transmitter and the supplemental or auxiliary mouth piece for the purpose of absorbing sound Waves other than those sent directly into the mouth piece. Again, so far as We have been able to discover, We are the first to prevent foreign sounds at the sending end of telephone set from entering the diaphragm and reverting to tie receiver, by absorbing such foreign sounds previous to the some impinging the diaphragm of the transmitter. By our method and. apparatus, We are enabled to prevent any noise in the vicinity oi? the-telephone instrument from entering the transmitter and reverting to the receiver.

While We have herein shown and described the i erred form oi our invention by Way or illustration, We Wish it to be understood that We do not limit or confine ourselves the precise details of construc tion herein described and delineated, as modification and variation may be made Within the scope of the claims sithout do parting roi'n the spirit of the invention.

li e claim:

1. The combination was a telephone transmitter, of a supplemental mouth piece secured to the mouth piece of the trans mitter, and a diaphragm of sound absorbing ma erial interposed between said pieces and partially cover]. th mitter mouth piece to abso other than those sent directly to; mouth piece. I

v 2. The combination with a telephone transmitter, of a supplemental mouth piece secured to the mouth piece of the trans mitt-er, and a cloth diaphragm interposed between said. mouth pieces and partially covering thetransmitter mouth piece to absorb sound Waves other than those sent directly through the mouth piece.

The combination -with a telephone transmitter, of a sound absorbing do ice secured to the mouth piece of the transmitter and comprising" a cup-shaped body disposed upon the outer end of the trans mittcr mouth piece and having the flangethereof surrounding the transmitter mouth piece concentrically of such mouth piece and the end all thereof formed With an opening alining' with the opening in the mouth piece and of less diameter than/that of the mouth piece, asuppleme'ntal mouth piece secured to the end-wall of said body,

concentrically oi theiopening therein and projecting outwardly therefrom and a diaphragm of sound absorbing material inter-- posed between the transmitter mouth piece and the end wall of said body across the opening in the end Wall of the body to absorb sound waves other than those sent directly through the mouth piece.

4. A sound absorbing device for telephone firansmibers comprising a two-part month In testimony whereof We aflix our signasecured to the transmitter, and a dim tures in presence of two witnesses.

h n sound absorbing material inter- EDWARD OSBORN. Between said parts and partially 0103- JAMES J. NOLAN. e oyening throng said parts to ab- Witnesses: orb sound waves other than those sent HOWARD OSBORN,

chreebay through the mouth piece. .T NOLAN; 

